Powder Coatings are based on polymer resin systems, combined with curatives, pigments, leveling agents, flow modifiers, and other additives. These ingredients are melted, mixed, cooled, and ground into a uniform powder. A spray gun is used to apply an electrostatic charge to the powder particles, which are then attracted to the grounded part. After the powder coating is applied, the parts must go through a curing oven. The heat causes the coating to bake to a fluid state that bonds the paint to the metal surface.